What is "deipnon"

In Greek, deipnon means the evening meal, usually the largest meal of the day. Hekate's Deipnon is, at its most basic, a meal served to the Titan Hekate and the restless dead once a lunar month. Ancient Athenians believed that once a lunar month, Hekate led the spirits of the unavenged or wrongfully killed accompanied by hounds from the underworld up from Hades. It is also the last day of the month according to the lunisolar based Attic calendar used in ancient Athens.